MOVING OBJECTS ON SURFACES
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United States of America Patent
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Issued Date -
Mar 9, 2017
app pub date -
Mar 2, 2015
filing date -
Mar 3, 2014
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Abstract
An apparatus comprises an object (1) and a plurality of roller units (5A-5D) on said object, each roller unit comprising at least one roller element (13) and being switchable between a mobile mode in which the apparatus is moveable across a surface on which said apparatus is positioned in use by rolling on said roller elements, and an immobile mode in which movement of the apparatus across a said surface is inhibited. The roller units (5A-5D) are configured such that manual depression of the object towards a said surface causes switching of at least one roller unit between the mobile and immobile modes.
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